What is the meaning of the word pentalcost day?

Pentecost Day, also known simply as Pentecost, is a Christian festival celebrated on the 50th day after Easter. It commemorates the descent of the Holy Spirit upon the apostles, as described in the New Testament book of Acts. This event marks the birth of the Christian Church and is often associated with themes of empowerment and the spread of the Gospel. The term "Pentecost" itself comes from the Greek Word "pentēkostē," meaning "fiftieth."